1,226 research outputs found
Nyugati folyóiratokban található meg a japán tudomány krémje?
No full textSTANKUS. T.-ROSSEEL, K.— LITTLEFIELD, W. C: Is the best Japanese science in western journals? = The Serials Librarian, 14. köt. 1-2. sz. 1988. p. 95-107
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Nuclear Dependence of J/w and w Production
No full textFNAL E866/NuSea has made a number of measurements of J/{psi} and {psi}{prime} production by 800 GeV protons on fixed targets of Be, Fe and W. Preliminary results are presented and discussed in the context of nuclear effects such as energy loss and multiple scattering of the partons, absorption of the produced c{bar c} pairs, and shadowing. Production mechanisms involving color-singlet or color-octet states for the c{bar c} pair which eventually forms a J/{psi} or {psi}{prime} have implications on the strength of absorption in the nucleus. These nuclear dependence studies arc critical in furthering the authors understanding of these processes towards future measurements at RHIC and the LHC, where J/{psi} suppression is predicted to be an important signature of the creation of quark-gluon plasma in heavy-ion collisions
W and Z boson production in p-Pb collisions at TeV root s(NN)=5.02 TeV
No full textThe W and Z boson production was measured via the muonic decay channel
in proton-lead collisions at root s(NN) = 5.02 TeV at the Large Hadron
Collider with the ALICE detector. The measurement covers backward (4.46
< y(cms) < 2.96) and forward (2.03 < y(cms) < 3.53) rapidity regions,
corresponding to Pb-going and p-going directions, respectively. The
Z-boson production cross section, with dimuon invariant mass of 60 <
m(mu mu) < 120 GeV/c(2) and muon transverse momentum (p(T)(mu)) larger
than 20 GeV/c, is measured. The production cross section and charge
asymmetry of muons from W-boson decays with p(T)(mu) > 10 GeV/c are
determined. The results are compared to theoretical calculations both
with and without including the nuclear modification of the parton
distribution functions. The W-boson production is also studied as a
function of the collision centrality: the cross section of muons from
W-boson decays is found to scale with the average number of binary
nucleon-nucleon collisions within uncertainties
W and Z boson production in p-Pb collisions at √sNN=5.02 TeV
No full textThe W and Z boson production was measured via the muonic decay channel in proton-lead collisions at sNN=5.02 TeV at the Large Hadron Collider with the ALICE detector. The measurement covers backward (−4.46 cms cms μμ 2 and muon transverse momentum (pT μ) larger than 20 GeV/c, is measured. The production cross section and charge asymmetry of muons from W-boson decays with pT μ > 10 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nuclear modification of the parton distribution functions. The W-boson production is also studied as a function of the collision centrality: the cross section of muons from W-boson decays is found to scale with the average number of binary nucleon-nucleon collisions within uncertainties.[Figure not available: see fulltext.
Synthesis of PbTiO₃ Thin Films by Annealing Multilayer Oxide Structures in Vacuum
No full textThis article presents investigation of syntheses of perovskite PbTiO₃ thin films by using reactive magnetron layer-by-layer deposition on Si (100) substrate and post-annealing in air and vacuum . The film stoichiometry was accurately controlled by the deposition of individual layers with the required ( ≈1 nm) thickness, using the substrate periodic moving over targets. Deposited thin films were annealed in air and in vacuum at 670°C and 770°C for 1 h, respectively. The morphological, structural, and chemical properties of thin films deposited at 300°C substrate temperature and post-annealed thin films using either conventional annealing and thermal annealing in vacuum at different temperatures were investigated and compared between. X-ray diffraction measurements of thin films annealed in air show formed crystalline perovskite PbTiO₃ phase with tetragonality c/a=1.047. The crystallite size of oxidized films depends on the substrate temperature. The structure of post annealed in vacuum thin films strongly depends on Pb/Ti atomic ratio. It was observed that the best structure and morphology forms when atomic ratio of Pb/Ti was 0.80. Pseudocubic phase of lead titanate forms with sufficiently low tetragonality at 670°C temperature
Measurement of parity-violating spin asymmetries in W production at midrapidity in longitudinally polarized collisions
No full textInternational audienceWe present midrapidity measurements from the PHENIX experiment of large parity-violating single-spin asymmetries of high transverse momentum electrons and positrons from W±/Z decays, produced in longitudinally polarized p+p collisions at center of mass energies of s=500 and 510 GeV. These asymmetries allow direct access to the antiquark polarized parton distribution functions due to the parity-violating nature of the W-boson coupling to quarks and antiquarks. The results presented are based on data collected in 2011, 2012, and 2013 with an integrated luminosity of 240 pb-1, which exceeds previous PHENIX published results by a factor of more than 27. These high Q2 data probe the parton structure of the proton at W mass scale and provide an important addition to our understanding of the antiquark parton helicity distribution functions at an intermediate Bjorken x value of roughly MW/s=0.16
Transverse single spin asymmetries of forward neutrons in p+p , p+Al , and p+Au collisions at \sqrt{s_{NN } }=200 GeV as a function of transverse and longitudinal momenta
No full textIn 2015 the PHENIX collaboration at the Relativistic Heavy Ion Collider recorded +, +Al, and +Au collision data at center of mass energies of √=200 GeV with the proton beam(s) transversely polarized. At very forward rapidities >6.8 relative to the polarized proton beam, neutrons were detected either inclusively or in (anti)correlation with detector activity related to hard collisions. The resulting single spin asymmetries, that were previously reported, have now been extracted as a function of the transverse momentum of the neutron as well as its longitudinal momentum fraction . The explicit kinematic dependence, combined with the correlation information allows for a closer look at the interplay of different mechanisms suggested to describe these asymmetries, such as hadronic interactions or electromagnetic interactions in ultraperipheral collisions, UPC. Events that are correlated with a hard collision indeed display a mostly negative asymmetry that increases in magnitude as a function of transverse momentum with only little dependence on . In contrast, events that are not likely to have emerged from a hard collision display positive asymmetries for the nuclear collisions with a kinematic dependence that resembles that of a UPC based model. Because the UPC interaction depends strongly on the charge of the nucleus, those effects are very small for + collisions, moderate for +Al collisions, and large for +Au collisions.【The members of PHENIX Collaboration not shown at the author section】
U. A. Acharya, C. Aidala, Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun, V. Babintsev, N. S. Bandara, K. N. Barish, S. Bathe, A. Bazilevsky, M. Beaumier, R. Belmont, A. Berdnikov, Y. Berdnikov, L. Bichon, B. Blankenship, D. S. Blau, J. S. Bok, V. Borisov, M. L. Brooks, J. Bryslawskyj, V. Bumazhnov, S. Campbell, V. Canoa Roman, R. Cervantes, M. Chiu, C.Y. Chi, I.J. Choi, J.B. Choi, Citron, M. Connors, R. Corliss, N. Cronin, T. Csörgő, M. Csanád, T. W. Danley, M. S. Daugherity, G. David, K. DeBlasio, K. Dehmelt, A. Denisov, A. Deshpande, E. J. Desmond, A. Dion, D. Dixit, J. H. Do, A. Drees, K. A. Drees, J. M. Durham, A. Durum, H. En'yo, A. Enokizono, R. Esha, S. Esumi, B. Fadem, W. Fan, N. Feege, D.E. Fields, M. Finger, Jr., M. Finger, D. Fitzgerald, S. L. Fokin, J. E. Frantz, A. Franz, A. D. Frawley, Y. Fukuda, P. Gallus, C. Gal, P. Garg, H. Ge, M. Giles, F. Giordano, Y. Goto, N. Grau, S.V. Greene, M. Grosse Perdekamp, T. Gunji, H. Guragain, T. Hachiya, J. S. Haggerty, K. I. Hahn, H. Hamagaki, H.F. Hamilton, J. Hanks, S. Y. Han, M. Harvey, S. Hasegawa, T. O. S. Haseler, T. K. Hemmick, X. He, J.C. Hill, K. Hill,11 A. Hodges, R.S. Hollis, K. Homma, B. Hong, T. Hoshino, N. Hotvedt, J. Huang, K. Imai, M. Inaba, A. Iordanova, D. Isenhower, D. Ivanishchev, B. V. Jacak, M. Jezghani, X. Jiang, Z. Ji, B. M. Johnson , D. Jouan, D. S. Jumper, J. H. Kang, D. Kapukchyan, S. Karthas, D. Kawall, A. V. Kazantsev, V. Khachatryan, A. Khanzadeev, A. Khatiwada, C. Kim, E.-J. Kim, M. Kim, T. Kim, D. Kincses, A. Kingan, E. Kistenev, J. Klatsky, P. Kline, T. Koblesky, D. Kotov, L. Kovacs, Kudo, K. Kurita, Y. Kwon, J. G. Lajoie, D. Larionova, A. Lebedev, S. Lee, S. H. Lee, M.J. Leitch, Y. H. Leung, N.A. Lewis, S.H. Lim, M. X. Liu, X. Li, V.-R. Loggins, D.A. Loomis, K. Lovasz, Lynch, S. Lökös, T. Majoros, Y. I. Makdisi, M. Makek, V. I. Manko, E. Mannel, M. McCumber, P. L. McGaughey, D. McGlinchey, C. McKinney, M. Mendoza, A.C. Mignerey, A. Milov, D.K. Mishra, J. T. Mitchell, M. Mitrankova, Iu. Mitrankov, G. Mitsuka, S. Miyasaka, S. Mizuno, M. M. Mondal, P. Montuenga, T. Moon, D. P. Morrison, B. Mulilo, T. Murakami, J. Murata, K. Nagai, K. Nagashima, T. Nagashima, J. L. Nagle, M.I. Nagy, I. Nakagawa, K. Nakano, C. Nattrass, S. Nelson, T. Niida, R. Nouicer, T. Novák, N. Novitzky, G. Nukazuka, A. S. Nyanin, E. O’Brien, C. A. Ogilvie, J. D. Orjuela Koop, J. D. Osborn, A. Oskarsson, G. J. Ottino, K. Ozawa, V. Pantuev, V. Papavassiliou, J. S. Park, S. Park, M. Patel, S. F. Pate, W. Peng, D. V. Perepelitsa, G. D. N. Perera, D. Yu. Peressounko, C. E. PerezLara, J. Perry, R. Petti, M. Phipps, C. Pinkenburg, R. P. Pisani, M. Potekhin, A. Pun, M.L. Purschke, P. V. Radzevich, N. Ramasubramanian, K. F. Read, D. Reynolds, V. Riabov, Y. Riabov, D. Richford, T. Rinn, S. D. Rolnick, M. Rosati, Z. Rowan, J. Runchey, A. S. Safonov, T. Sakaguchi, H. Sako, V. Samsonov, M. Sarsour, S. Sato, B. Schaefer, B. K. Schmoll, K. Sedgwick, R. Seidl, A. Sen, R. Seto, A. Sexton, D. Sharma, I. Shein, T.-A. Shibata, K. Shigaki, M. Shimomura, T. Shioya, P. Shukla, A. Sickles, C. L. Silva, D. Silvermyr, B. K. Singh, C. P. Singh, V. Singh, M. Slunečka, K.L. Smith, M. Snowball, R.A. Soltz, W.E. Sondheim, S.P. Sorensen, I. V. Sourikova, P. W. Stankus, S. P. Stoll, T. Sugitate, A. Sukhanov, T. Sumita, J. Sun, Z. Sun, J. Sziklai, K. Tanida, M. J. Tannenbaum, S. Tarafdar, A. Taranenko, G. Tarnai, R. Tieulent, A. Timilsina, T. Todoroki, M. Tomášek, C. L. Towell, R.S. Towell, I. Tserruya, Y. Ueda, B. Ujvari, H. W. van Hecke, J. Velkovska, M. Virius, V. Vrba, N. Vukman, X. R. Wang, Y. S. Watanabe, C. P. Wong, C. L. Woody, L. Xue, C. Xu, Q. Xu, S. Yalcin, Y. L. Yamaguchi, H. Yamamoto, A. Yanovich, I. Yoon, J. H. Yoo, I.E. Yushmanov, H. Yu, W.A. Zajc, A. Zelenski, S. Zharko, and L. Zoujournal articl
Classification of Hereditary Matrices
No full textA classical approach used to obtain basic facts in the theory of square matrices involves an analysis of the relationship between polynomials p in one variable and square matrices T such that p(T) = 0. We consider matrices and operators which satisfy a different type of polynomial constraint. Let H be a complex Hilbert space, T be a bounded linear transformation of H, T* be the adjoint of T, and C[x, y] be the algebra of polynomials in x and y with complex coefficients. For a polynomial p E C[x, y] in two variables with complex coefficients, define p(T) = Σm, n ≥, 0 p ^(m, n)T* nTm, where p ^ (m, n) is the coefficient of ynxm in the expansion of p in a power series about the point (0, 0). T is called a root of p if and only if p(T) = 0. Note that if p E C[x, y] is a polynomial in the single variable x, then the definition of p(T) given here agrees with the classical definition. In this paper, we study the relationships which p(T) = 0 forces between p and T when T is an algebraic operator (i.e., there exists n ≥ 1 and complex numbers a0, …, an − 1 such that 0 = a0 + a1T + … + an − 1Tn − 1 + Tn). The classification starts with the following observation: Suppose p E C[x, y] and an algebraic operator T E L(H) satisfy p(T) = 0. Then certain subspaces of H which are invariant for T must be orthogonal or certain coefficients of p must vanish. This leads to the notions of a graph attached to each p E C[x, y] and a graph attached to each square matrix T. For diagonalizable T, a necessary and sufficient graph theoretic condition for solving p(T) = 0 is given. For nondiagonalizable T, this condition is necessary, but not sufficient. The use of these graphs does, however, reduce the problem to the problem of solving the equation p(T) = 0 for T with exactly one or two eigenvalues. For T with one eigenvalue, we give a necessary and sufficient condition for solving p(T) = 0. This leaves the case of solving p(T) = 0 when T has exactly two eigenvalues. This problem mixes algebra involving polynomials with matrix theory. We show that it is equivalent to the purely algebraic problem of determining if equations of the form Σ(i, j) E ECi, jXi + r, j + s = 0 have solutions of finite support with certain nonvanishing properties. We call these equations bi-Hankel equations subordinate to a given subset E of the lattice of integer pairs {(i, j) : 0 ≤ i ≤ m − 1, 0 ≤ j ≤ n − 1}. It turns out that there is an algorithm (which uses Gröbner bases) for determining if the type of solution we seek exists and for computing it
Cross Section and Parity-Violating Spin Asymmetries of W(+/-) Boson Production in Polarized p plus p Collisions at root s=500 Gev
No full textLarge parity-violating longitudinal single-spin asymmetries A(L)(e+) = 0.86(-0.14)(+0.30) and Ae(L)(e-) = 0.88(-0.71)(+0.12) are observed for inclusive high transverse momentum electrons and positrons in polarized p + p collisions at a center-of-mass energy of root s = 500 GeV with the PHENIX detector at RHIC. These e(+/-) come mainly from the decay of W(+/-) and Z(0) bosons, and their asymmetries directly demonstrate parity violation in the couplings of the W(+/-) to the light quarks. The observed electron and positron yields were used to estimate W(+/-) boson production cross sections for the e(+/-) channels of sigma(pp -> W(+)X) X BR(W(+) -> e(+) nu(e)) = 144.1 +/- 21.2(stat)(-10.3)(+3.4)(syst) +/- 21.6(norm) pb, and sigma(pp -> W(-)X) X BR(W(-) -> e(-) (nu) over bar (e)) = 3.17 +/- 12.1(stat)(-8.2)(+10.1)(syst) +/- 4.8(norm) pb.Office of Nuclear Physics in DOE Office of ScienceNational Science Foundation NSF (USA)MEXT (Japan)JSPS - Japan Society for the Promotion of Science (Japan)CNPq (Brazil)FAPESP (Brazil)NSFC (China)MSMT (Czech Republic)Centre National de la Recherche Scientifique - IN2P3/CNRS (France)CEA (France)BMBF - Bundesministerium fur Bildung und Forschung, Germany(DAAD) Deutscher Akademischer Austausch Dienst, GermanyAlexander von Humboldt Foundation (Germany)OTKA (Hungary)(DAE) Department of Atomic Energy, India(DST) Department of Science and Technology, IndiaISF - Israel Science Foundation (Israel)NRF (Korea)WCU (Korea)MES Ministry of Education and Science of the Russian FederationRAS Russia Academy of SciencesFAAE (Russia)VR (Sweden)KAW (Sweden)U.S. CRDF for the FSUHungary-U.S. HAESF(BSF) US-Israel Binational Science Foundatio
Cross section and longitudinal single-spin asymmetry for forward production in polarized collisions at GeV
No full textInternational audienceWe have measured the cross section and single-spin asymmetries from forward W±→μ±ν production in longitudinally polarized p+p collisions at s=510 GeV using the PHENIX detector at the Relativistic Heavy Ion Collider. The cross sections are consistent with previous measurements at this collision energy, while the most forward and backward longitudinal single spin asymmetries provide new insights into the sea quark helicities in the proton. The charge of the W bosons provides a natural flavor separation of the participating partons
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